Fix Go formatting in beam and dockerscript

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

beam/router_test.go

@@ -3,13 +3,13 @@ package beam
 import (
 	"fmt"
 	"io/ioutil"
-	"testing"
 	"os"
 	"sync"
+	"testing"
 )
 
 type msg struct {
-	payload []byte
+	payload    []byte
 	attachment *os.File
 }
 
@@ -17,7 +17,6 @@ func (m msg) String() string {
 	return MsgDesc(m.payload, m.attachment)
 }
 
-
 type mockReceiver []msg
 
 func (r *mockReceiver) Send(p []byte, a *os.File) error {